Endoscopic fine needle aspiration of a mass in the head of the pancreas. Ductal adenocarcinoma cells are seen adjacent to a sheet of benign ductal cells.
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Endobronchial ultrasound guided transbronchial needle aspiration of a mediastinal lymph node revealing Histoplasma capsulatum. Histiocytes filled with small intracellular yeasts were seen on Diff-Quick stain.
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Thyroid nodule surgical resection demonstrating the transition from adenoma to carcinoma. Follicular cells are seen penetrating the fibrous capsule on a path to invasion.
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Excision of a mass from the parapharyngeal space reveals a paraganglioma. Tumor cells are seen arranged in an organoid (zelballen) pattern.
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Fine needle aspiration of a neck lymph node demonstrating metastatic keratinizing squamous cell carcinoma. A primary lesion was found at the base of tongue.
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Thyroidectomy revealing eosinophilic tumor cells with tall morphology adjacent to normal thyroid tissue. What is the diagnosis? Answer:
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Thyroidectomy showing lymphocytic (Hashimoto's) thyroiditis. A lymphocytic infiltrate with germinal center formation is seen adjacent to thyroid follicles with oncocytic change.
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